Topic: New speaker idea Alpair 12P / Lowther DX-3 / Acoustic Elegance Dipole 15 (Read 6304 times)

OJneg · « **Reply #10 on:** December 04, 2014, 04:25:50 AM »

Hate to be the debbie downer in this thread but I think I'm going to start moving away from my OB project. It's just not there for me anymore. I'm going back to the sound of my 2-way mini-monitors and they seem to regularly wow me with their capabilities. Despite the fact that they're cheap as hell. My next project will probably be a 2-way monitor-type speaker in a medium sized enclosure that I can place strategically on stands. With an emphasis on high quality drive units (thinking ScanSpeak) and a tweeter that reliably performs on a smaller baffle. This design looks very enticing for me ATM but I'll need to look at more options:

http://www.troelsgravesen.dk/DiscoveryW18.htm

As far as I'm concerned my project and its components are Changstar property. Marv, next time we meet up I'll hand off the waveguide AMT's; I think you'll like them. You can also have the 15A's for research purposes. Or if someone else wants them to build some crazy subwoofers let me know

DaveBSC · « **Reply #11 on:** December 04, 2014, 06:06:46 AM »

There's definitely a reason why the humble two-way has been around so long pretty much unchanged in basic concept. The stepped baffle idea is an interesting one, provided that the diffraction and reflection issues can be dealt with as mentioned in the article. A waveguide would avoid those issues and still allow for time alignment, but it's REALLY easy to mess that up and end up with a fire spitting mess.

I wonder why not just opt for a sloped baffle ala Reference 3A?

zerodeefex · « **Reply #12 on:** December 06, 2014, 06:34:15 PM »

been thinking on this for a long time.

Go with the cheaper woofers. Worst case you add fancy standalone woofers and cross over somewhere between 45 and 60Hz. Two fast, powerful 15s or 18s filling in the bottom end with plenty of juice from an ep4000 or something similar will be AWESOME and you don't have to commit to getting them until you spend time with your finished build.

The spirit of the project is to middle finger speakers on the market with something epic and affordable. I think you should keep to this as much as possible (no $340 woofers for now).

Marvey · « **Reply #13 on:** December 07, 2014, 01:45:38 AM »

Quote from: OJneg on December 04, 2014, 04:25:50 AM

Hate to be the debbie downer in this thread but I think I'm going to start moving away from my OB project. It's just not there for me anymore. I'm going back to the sound of my 2-way mini-monitors and they seem to regularly wow me with their capabilities. Despite the fact that they're cheap as hell. My next project will probably be a 2-way monitor-type speaker in a medium sized enclosure that I can place strategically on stands. With an emphasis on high quality drive units (thinking ScanSpeak) and a tweeter that reliably performs on a smaller baffle. This design looks very enticing for me ATM but I'll need to look at more options:

http://www.troelsgravesen.dk/DiscoveryW18.htm

As far as I'm concerned my project and its components are Changstar property. Marv, next time we meet up I'll hand off the waveguide AMT's; I think you'll like them. You can also have the 15A's for research purposes. Or if someone else wants them to build some crazy subwoofers let me know

I have really really really nice silk dome tweeters for you.

The best of the classic tweeters. you can cross down low 2kHz with 2nd order.

OJneg · « **Reply #14 on:** December 07, 2014, 06:24:30 AM »

Quote from: marvey on December 07, 2014, 01:45:38 AM

I have really really really nice silk dome tweeters for you.

The best of the classic tweeters. you can cross down low 2kHz with 2nd order.

That would be perfect

Marvey · « **Reply #15 on:** December 07, 2014, 08:53:04 AM »

This is what I have for you: http://www.scan-speak.dk/datasheet/pdf/d2905-990000.pdf

Measures better in RL than on their spec-page.

na · « **Reply #16 on:** December 07, 2014, 10:14:32 PM »

Have you tried Audio-Nirvana full-range speakers?
I have not heard myself but they have interesting new "classic" line. It seems there is coming 12" Classic FR also.
Money back guaranteed, sounds good to me. And the price is right.

I would try those, but shipping to Europe+customs is too much just to find out...
Just thinking that good full-range could improve even more the spaciousness, 3-dimensionality, because the sound is coming from one "spot".
With 2-ways, 3-ways, 4-ways etc. comes the crossover problems if they are not designed well, and still they have problems.

The loudspeakers building is maybe the hobby what i enjoy the most, i think it is the "link in the chain" where is easiest to make the system sound better...or worse

I have build Troels, Tony Gee, GR-Research, Strassacker, Hifitalo, and some other designs but my favourite speaker-genius guy is Wayne Parham from Pispeakers. Build the 4Pi or some corner horns and i think you have speakers for long time

Regards,
na

Marvey · « **Reply #17 on:** December 10, 2014, 06:59:25 PM »

Quote from: na on December 07, 2014, 10:14:32 PM

Have you tried Audio-Nirvana full-range speakers?
I have not heard myself but they have interesting new "classic" line. It seems there is coming 12" Classic FR also.
Money back guaranteed, sounds good to me. And the price is right.

I would try those, but shipping to Europe+customs is too much just to find out...
Just thinking that good full-range could improve even more the spaciousness, 3-dimensionality, because the sound is coming from one "spot".
With 2-ways, 3-ways, 4-ways etc. comes the crossover problems if they are not designed well, and still they have problems.

The loudspeakers building is maybe the hobby what i enjoy the most, i think it is the "link in the chain" where is easiest to make the system sound better...or worse
I have build Troels, Tony Gee, GR-Research, Strassacker, Hifitalo, and some other designs but my favourite speaker-genius guy is Wayne Parham from Pispeakers. Build the 4Pi or some corner horns and i think you have speakers for long time

Regards,
na

The pi's sound interesting. I have some old Altec compression horns sitting around that I want to do something with. Will take a different approach and not corner load. I don't see myself not doing open-baffle bass. Bass in boxes seems to problematic for rooms, unless one wants to spend a fortune and real-estate on bass traps effective at 50Hz. It's like what Donald North said, once I did it, I wouldn't want to go back.

Marvey · « **Reply #18 on:** December 10, 2014, 07:05:47 PM »

Quote from: DaveBSC on December 04, 2014, 01:21:00 AM

Have you considered doing a full mirror of the drivers? I don't think I've ever seen this done in a fully open baffle configuration.

I'm actually not pushing the 15" woofer hard with compensation. Just a 3db boost to extend it down a few Hz to 45-50Hz. Letting a sub take over below that.

So really no need for another woofer considering my use is at low to moderate volumes. Adding another woofer would be too problematic because it would reduce the excursion too much. There's an ideal loudness level that drivers like to be driven at. Too little excursion = small signals might be absorbed by the surround, spider, etc.

I'd add an extra woofer if I wanted a headbanger setup.

Marvey · « **Reply #19 on:** December 16, 2014, 04:10:40 AM »

Well, one of the Moth Cicada drivers started to distort recently. I guess it was matter of time with these being stuck in an equipment locker through ten or so summers in Calabasas. It did get me to re-thinking. Perhaps a simple + wide ranger might be a better idea. I really liked the Cicadas as the only thing between them and the amp was a single cap. So much less complexity.

Going back to the Alpair 12P paper 8" driver with 92db sensitivity. Just bought two from Madisound. We'll see how well this driver works: http://www.markaudio.com/Plans/itemlist/category/26-Alpair-12P. I'm glad Markaudio is making paper drivers now. The metal drivers of their prior generation I was always scared of. We'll see if the specs with the A12P are BS or not, or if it sounds as good as the manufacturer makes it out to be.

The other choice would have been the Dayton point source 8": http://www.parts-express.com/dayton-audio-ps220-8-8-point-source-full-range-neo-driver--295-346. But I have servere reservations with the Dayton being paper/kevlar. I'm not a big fan of kevlar drivers. See peaky response: http://www.parts-express.com/pedocs/brochures/295-346-dayton-audio-ps220-8-brochure-9530.pdf

Author Topic: New speaker idea Alpair 12P / Lowther DX-3 / Acoustic Elegance Dipole 15 (Read 6304 times)

OJneg

Re: New speaker idea

DaveBSC

Re: New speaker idea

zerodeefex

Re: New speaker idea

Marvey

Re: New speaker idea

OJneg

Re: New speaker idea

Marvey

Re: New speaker idea

na

Re: New speaker idea

Marvey

Re: New speaker idea

Marvey

Re: New speaker idea

Marvey

Re: New speaker idea

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Author Topic: New speaker idea Alpair 12P / Lowther DX-3 / Acoustic Elegance Dipole 15 (Read 6304 times)